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Sweet and warm, non-toxic.
The *Shennong Bencao Jing* (Divine Farmer's Materia Medica) states it treats wind-induced spasms and contractures, hemiplegia, and obstruction of Qi and blood flow.

[Invention] The wild goose is a bird of fidelity; how can it be eaten? Therefore, Daoists call it "Tianyan" (Annoyance of Heaven). Its nature is good at promoting the free flow of Qi and blood. For wind-induced spasms and contractures or hemiplegia, roast the meat and apply it topically to the affected area. In ancient times, the Yellow Emperor made the needle for the south-pointing chariot using the hollow cavity of the goose's shin bone, taking advantage of its ability to determine north and south. However, finding such bones is difficult; nowadays, people use carp brain to make them, because the carp's nature is specifically grounded in earth, stable and immovable, which can determine the direction of water and earth.

That is, domestic duck
Sweet and warm, non-toxic. Young ducks are toxic; old ducks are non-toxic.

[Invention] Ducks are born close to fire and grow relying on water. Before hatching from the egg, they first acquire fire energy, so they do not fear ice and snow, but prefer excessive rain. Their tail has the strongest rank odor and turbidity. Therefore, when one female duck is exposed to this qi, all the hens in the flock gain the mechanism of generation and transformation, without needing the tail to spread throughout the body. Warming the middle and tonifying deficiency, supporting Yang and promoting urination are its inherent nature. It is most suitable for men with weak Yang Qi. It is also appropriate for patients suffering from edema. Black-beaked white-feathered ducks treat chronic deficiency of the stomach and intestines; Ge Kejiu's Baifeng Gao (White Phoenix Paste) uses them, drawing on the principle of Metal generating Water. Green-headed old ducks treat sudden swelling due to Yang-type edema; the Yadou Wan (Duck Head Pill) in the *Waitai Miyao* (Essential Prescriptions from the Imperial Cabinet) uses them, drawing on the principle of unblocking and regulating the water passages. White ducks generate blood, tonify blood, and detoxify. For hemorrhage due to labor injury, mixing with hot wine and ingesting has proven effective repeatedly. Duck saliva treats thorns from grain entering the throat and infantile tetanus with opisthotonos; dripping it causes immediate relief. Duck eggs can obstruct Qi and cloud mental clarity. Duck meat is contraindicated in various diseases, especially dysentery. White ducks can detoxify mineral medicines. For those who have taken an overdose of medicine leading to coma and dizziness, take one he of Baiyatong (a specific part/preparation of white duck), soak in water, clarify, and drink to resolve the toxicity; do not discard it due to its perceived filth.

That is, wild duck
Sweet and neutral, non-toxic.

[Invention] Wild ducks fly in flocks, hiding in summer and appearing in winter, similar to swans and geese. After September and before the Start of Spring, their taste is extremely delicious, and patients eating them fare much better than with domestic ducks. Because they are fatty but not greasy, and easy to digest, they are suitable for dysentery and diarrhea, wheezing and coughing with rebellious Qi, consumptive fatigue with blood loss, as well as postpartum and post-illness conditions. Although they have the merit of calming the middle and promoting urination, they are rarely mentioned in prescriptions. Meng Shen's claims about removing eleven types of parasites cannot be fully trusted. The *Zhaixuan Fang* (Excerpted Mysterious Formulas) treats fresh Gu poison by drinking raw wild duck blood hot and inducing vomiting. From this, we can understand that raw goose blood can expel worms and blood stasis from the chest and abdomen, relying entirely on the power of blood guiding blood and resonance of same Qi.